The Issaquah, Wash.-based warehouse club declined to offer much more about the items _ or on how many people are buying the kit.

"We don't normally give out sales data," the company said in an email to the Detroit Free Press. "The idea came about making a great starter kit for a family who wanted to prepare for any kind of disaster. This is a great value with shipping included."

Obviously, the disaster would have to be catastrophic for someone to need that much food, but entrepreneurs have long found ways to profit from people's fears, especially when they involve an apocalyptic scenario: being wiped out by a massive hurricane, getting caught in clashes among groups with fanatical beliefs and facing fallout from a nuclear war.

How much of a market is there for these emergency kits?

"Right now, it's too small of a trend to track," said Jeff Gelski, associate editor of Food Business News in Kansas City, Mo., who has been writing about the food industry for more than a decade. "But, if Costco's in it, it might be something that's about to pop."

There are smaller and larger emergency food kits for sale, too.

In addition to a variety of online sellers, Walmart offers emergency food storage kits with enough food for two days, three days, a month, and a year that sell for $25.88, $58.99, $134.99, and 1,290.99, respectively.

Costco is offering even bigger food kits, too, for $3,999.99 and $5,999.99.

The customers are "working people who fear for their lives," said Ken Dalto, a retail expert with Kenneth J. Dalto in Bingham Farms, Mich. He added that it's too soon to know how well these emergency kits are selling, but that with a nation of 320 million, there are plenty of people who are nervous about the future.

"You have hurricanes. You saw what that did," he said, referring to Hurricanes Harvey, Irma and Maria, which battered Texas, Louisiana, Florida and Puerto Rico. "You add to that climate change, and terrorism, and the idea of nuclear war, which is very much in the news with North Korea, and they can develop a missile that might be able to hit California _ even Seattle."

In August, a month after North Korea tested an intercontinental ballistic missile, three-quarters of Americans said that North Korea's nuclear program is a critical threat facing the U.S., according to a Chicago Council on Global Affairs survey.

Last year, the survey showed 60 percent of Americans feared North Korea. It was 55 percent in 2015.

Dalto said people feel they can't prevent these disasters, so they do what they can: They shop.

Profiting from things that make people feel more secure is not new.

Remember businesses that marketed backyard bomb shelters during the Cold War? Or all the computer software upgrades aimed at preventing the end of the world in a Y2K meltdown at the turn of the millennium?

"There's always that flip side that during tragedy, there's someone that's going to come out on top," said Adam Lovett, a salesman at Harry's Army Surplus in Dearborn, Mich. "You're in the business of: The worse it gets, the more you make. It's sad, but true."

How scared are folks now?

"There's a lot of people coming in now who are quite worried," he said, adding that most of them seem to be most troubled by political discord. "It's not at panic status or anything like that, but there are heightened concerns."

Mostly, he said, people are seeking to buy fire-starters, such as flint and steel strikers or waterproof matches; water purifiers, such as filters and chemical tablets, and simple outdoor shelters such as tents and lean-to devices.

Some people, he added, are even seeking survival kits in backpacks in case they have to leave their homes a hurry. Those run less than $100.

Still, academics say no matter how convincing businesses are, sometimes it makes sense to invest more in information than in stuff.

"There's a new fear all the time," said Brian Bierley, director of media relations at Oakland University in Rochester, Mich. "The people in Florida are living off the hurricane fear, and if they don't get hit, there's always something. On Twitter, there's a new threat every day."

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